Progress in the breeding program of the male components of rye hybrids for fertility restoration in the Pampa cytoplasm
Irena Kolasińska
i.kolasinska@ihar.edu.plZakład Genetyki i Hodowli Roślin Instytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy w Radzikowie (Poland)
Abstract
Abilities to restore male fertility in the Pampa cytoplasm were studied for numerous rye genotypes in the years 2013–2016. Plant material involved S2 and S3 inbred lines, male parents (restorer synthetics) and their test hybrids derived from the current breeding program in Smolice Plant Breeding Ltd. The S2 i S3 inbred lines were developed from new breeding populations including donors of restorer genes with different origins (R-pol, R-pop, R-tur). The inbred lines and the male parents were crossed to the same hard-restoration tester (CMS-Tt) under isolation bags, between isolation walls and in foil tunnels. The level of male fertility of tested hybrids was assessed in two growing conditions (foil tunnel, field) by pollen shedding visual scores of plant plots and/or by anther dehiscence visual scores of single plants with a 1–9 scale. The restoration indices (RI%) were calculated according to the formula: RI = % of male fertile (%mf) plants + 1/2% of partially male fertile plants (%pmf). In the years 2013–2016, a considerable progress was achieved in the improvement of male fertility restoring ability in the Pampa cytoplasm compared to the previous period 2009–2013. Majority of the newly developed inbred lines and created male parents were highly effective in restoration of male fertility in the Pampa cytoplasm. High frequency of effective restorers (IR>70%) and full restorers was found in each group of genotypes. Several genotypes with different origins were able to restore completely pollen fertility (IR = 100%) of their test hybrids cultivated in both growing conditions — foil tunnel and field. Very effective restorers directly could be used for creation of Pampa-based rye hybrids with improved male fertility. In addition, the best of them should be also utilized as restoring gene donors in breeding programe of rye hybrids.
Keywords:
hybrid breeding, male sterility, Pampa cytoplasm, restorer identification, restoration of male fertility, ryeReferences
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Authors
Irena Kolasińskai.kolasinska@ihar.edu.pl
Zakład Genetyki i Hodowli Roślin Instytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy w Radzikowie Poland
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